山东丘陵地苹果产量的主要限制因素是缺水少肥。即使在肥水比较充裕的地方,也要考虑节水、节肥、节工等等问题。采用地膜覆盖、穴贮肥水这个措施,获得苹果丰产,并已推广,本文拟从热力学角度探讨是项增产措施的理论根据。 一、缺水少肥造成减产的实质是树体负熵流不足 苹果树体( Shandong hilly apple production is the main limiting factor of water less fat. Even in the more abundant water and fertilizer, but also consider saving water, fertilizer, labor and so on. Using the method of mulching and storing fertilizer and water, the apple yield was obtained and popularized. This paper intends to discuss the theoretical basis of the stimulation measures from the perspective of thermodynamics. First, the lack of water and less fat caused by the reduction of the actual tree negative entropy flow Apple tree (